Enhancing the Capacity and Stability by CoFe₂O₄ Modified g-C₃N₄ Composite for Lithium-Oxygen Batteries

As society progresses, the task of developing new green energy brooks no delay. Li-O₂ batteries have high theoretical capacity, but are difficult to put into practical use due to problems such as high overvoltage, low charge-discharge efficiency, poor rate, and cycle performance. The development of high-efficiency catalysts to effectively solve the shortcomings of Li-O₂ batteries is of great significance to finding a solution for energy problems. Herein, we design CoFe₂O₄/g-C₃N₄ composites, and combine the advantages of the g-C₃N₄ material with the spinel-type metal oxide material. The flaky structure of g-C₃N₄ accelerates the transportation of oxygen and lithium ions and inhibits the accumulation of CoFe₂O₄ particles. The CoFe₂O₄ materials accelerate the decomposition of Li₂O₂ and reduce electrode polarization in the charge-discharge reaction. When CoFe₂O₄/g-C₃N₄ composites are used as catalysts in Li-O₂ batteries, the battery has a better discharge specific capacity of 9550 mA h g^-1 (catalyst mass), and the cycle stability of the battery has been improved, which is stable for 85 cycles.